The si unit full form is International System of Units. The present form of the metric system is the International System of Units (SI, abbreviated from the French Système international (d’unités)). It is the only method of measuring recognized by practically every country on the planet. It is made up of seven base units:
- Length – meter (m)
- Mass – kilogram (kg)
- Time – second (s)
- Amount of substance – mole (mole)
- Temperature – kelvin (K)
- Electric current – ampere (A)
- Luminous intensity – candela (cd)
The SI consists of seven base units that define 22 derived units with unique names and symbols. The SI is widely utilized in scientific and technological research and development, as well as in international business.
The International System of Units (SI), also known as the metric system, is the global measurement standard. On May 20, 1875, seventeen countries, including the United States, signed the International Treaty of the Meter in Paris, which is today known as World Metrology Day.